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Officers revealed a lump hammer had been used in the brutal attack which killed Carole Kolar, 58, and Avtar Kolar, 62, who had been married for 40 years.

Detective Chief Superintendent Steve Jupp, of West Midlands Police, said the motive for the couple’s murder had nothing to do with their policeman son's job, police work with gangs, or the theft of gold.

"I can confirm that the motive of these murders was not due to the fact that Jason is a serving police officer," Mr Jupp said.

"I can also confirm that it was nothing to do with the work the force undertakes in relation to gangs.

"I can also confirm that the motive was not in relation to the theft of gold.

"The devastating impact of such a senseless crime has been far-reaching and the comfort drawn by the family from words of friends, the community and further afield has been much appreciated by them.”

At an emotional press conference the day after the couple were found dead on January 11, their son and daughter Michelle Kirwan, 39, and her brother Avtar Kolar, 32, held hands as they said their hearts had been "broken forever".

Liorancas, who was arrested at a Birmingham address, was the third person to be arrested on suspicion of the double murder.

Two men, aged 41 and 24, who were previously arrested in connection with the murders have been released without charge, West Midlands Police said. Detectives added that a number of items stolen from the property had been found.

Mr Jupp said: "The investigation into Carole and Avtar's death has been complex and very fast-moving.

"I would like to say thank you to those who have come forward and given us our information. It is the information given by local people to our officers that is vital and in this case we have received a number of very important phone calls.

"We are not looking for anyone else in connection with this murder but much work remains to be done to bring this investigation to court.

"The Kolar family have been updated at each stage of our inquiry and continue to be supported by specialist officers and staff. We hope that they will now be given some time and privacy to grieve their tragic loss."